The Woodstock Music Festival took place in 1969, which was appropriate because it can be seen as the climax of the social changes that had taken place in the 1960s.
Woodstock was the climax of these changes because it was a very public display of those values. There was a great deal of drug use. There was public nudity. There was a lot of the kind of music that typified that “sex, drugs, and rock and roll” ethos of the 1960s. The fact that all of this was happening very much in the public eye and with large numbers of people involved meant that it was an event that was more prominent than any other display of these new values.
By displaying the new values in such a public way, Woodstock served as a climax to the changes of the 1960s.